Aquafortis is specifically nitric acid. It’s called that because it can dissolve “any” metal except for gold. Where “any” is “anything they knew about in the middle ages”.

also, green vitriol is actually green. And blue vitriol, copper sulfate, is (surprise) blue. Copper sulfate is also what they put in antifreeze as a vomiting agent. I once had a single drop as a mistake, and it works REALLY well.